What is the name of the indicator which can be used for testing the pH of a solution ?

Open in App

Solution

A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH(acidity or basicity ) of the solution can be determined visually.

Now a halochromic material is a substance that changes colour when pH changes occur. The term 'chromic' is defined as materials that can change colour reversibly with the presence of a factor. In this case, the factor is pH. All pH indicators have this property.

Hence, a pH indicator is a chemical detector which detects hydronium ions (H₃O⁺) or hydrogen ions (H⁺) in the Arrhenius model.

Suggest Corrections

Similar questions

Which one of the following solutions would you use to test the pH of a given sample?
(1) blue litmus solution
(2) red litmus solution
(3) universal indicator solution
(4) mixture of red and blue litmus solution

Q. A student took a sodium salt and dissolved it in water. When this aqueous sodium salt solution was tested with universal indicator paper, its pH was found to be 9.
(a) What does pH 9 tell us about the sodium salt solution?
(b) Name one sodium salt which can produce such a solution.

Q. Five solutions A to E were tested with the universal indicator to find their pH. The results are shown below.
A. pH 1
B. pH 4
C. pH 7
D. pH 9
E. pH 11

(a) Which solution is neutral?
(b) Which is strongly acidic?
(c) Which is strongly basic?
(d) Which is weakly acidic?

Q. Olfactory indicators can be used in the laboratory to test whether a solution is basic or acidic. This process is called:

Q. A universal indicator paper is dipped separately in each of the solutions in the given test tubes. Which solution will have the highest pH?

Join BYJU'S Learning Program